Dynamic pivot queries with dynamic dates as column header

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I need to pivot the table as shown below

Dates 2016-01-17 2016-01-18 2016-01-19

Orders 100 120 150

CanceledOrders 50 20 30

Can anyone give me suggestions in writing query?Here Dates have to come dynamically.

What I have tried:

This is Sql actual Result Set

----------------------------------
| Dates |Orders |Canceled Orders|
----------- |----- |---------------|
|2016-01-17 |100 | 50 |
|2016-01-18 |120 | 20 |
|2016-01-20 |150 | 30 |
----------------------------------

Posted 17-Jan-17 18:43pm

Member 12085957

Updated 18-Jan-17 7:17am

v4

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Maciej Los 18-Jan-17 2:19am

Sorry, but your question is unclear. Please, be more specific and provide more details, such as expected output.

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NightWizzard · Answer 1 · 2017-01-18T07:17:00

If the number of date columns is variable there is no chance to solve this problem with T-SQL language (anyway you might do this with a CLR function in C# or VB.net).

If the number of date columns is fixed and always the same, you can do something like:

SQL

DECLARE @date1 AS nvarchar(10);
DECLARE @date2 AS nvarchar(10);
DECLARE @date3 AS nvarchar(10);
DECLARE @query AS nvarchar(max);

--Gather your dates and set them as column headers (nvarchars ):
SET @date1 = <first date found>;
SET @date2 = <second date found>;
SET @date3 = <third date found>;

--Now create your query as nvarchar(max) variable:
SET @query = 'SELECT <a field>
                   , <another field>
                   , SUM(<first field to summarize>) AS [' + @date1 + '] 
                   , SUM(<second field to summarize>) AS [' + @date2 + ']
                   , SUM(<third field to summarize>) AS [' + @date3 + ']
               FROM [dbo].[<source table name>]
              WHERE (<any filter expressions here>)';

--Execute the query
EXEC sp_executesql @query;